JULIA_WAIT_FOR_TRACY=1 doesn't work

[nsajko]

This doesn't work as documented, julia doesn't wait for Tracy to connect:

A typical workflow for profiling Julia with Tracy involves starting Julia using:

JULIA_WAIT_FOR_TRACY=1 ./julia -e '...'

The environment variable ensures that Julia waits until it has successfully connected to the Tracy profiler before continuing execution. Afterward, use the Tracy profiler UI, click Connect, and Julia execution should resume and profiling should start.

Source: https://docs.julialang.org/en/v1.13-dev/devdocs/external_profilers/

[topolarity]

Is this from a Tracy-enabled build of Julia? The support is not compiled in by default

[nsajko]

Yeah, I compiled Julia with make MARCH=native MCPU=native MTUNE=native WITH_TRACY=1. Tracy works fine, I can connect, save the data, and view it. The problem is just the "Julia waits until it has successfully connected to the Tracy profiler before continuing execution" part.

[topolarity]

Huh, I'm not able to reproduce locally.

What are your system details?

[nsajko]

Archlinux

Julia Version 1.13.0-DEV.232
Commit 7d161265e9 (2025-03-16 15:48 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: 8 × AMD Ryzen 3 5300U with Radeon Graphics
  WORD_SIZE: 64
  LLVM: libLLVM-19.1.7 (ORCJIT, znver2)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)
Environment:
  JULIA_NUM_PRECOMPILE_TASKS = 4
  JULIA_PKG_PRECOMPILE_AUTO = 0

[topolarity]

Can you confirm you did a make cleanall before doing the build?